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1.23ct J SI2 Round Natural Diamond

EX • J/SI2 • IGI 628465258

Shape and cutting style on the report: Round brilliant

Certificate IGI 628465258

Diamond specifications and retailer prices

From £1,080 GBP
As of November 6, 2026
Save £2,083 GBP (66%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £3,164 GBP at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1.23ct natural round diamond

This 1.23ct natural round sits in the classic one-carat band, graded J colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI 628465258. Listed at 14 retailers as of November 5, 2026, with prices from £1,080 to £3,164, a £2,083 spread on the same certified stone. NZ Jewellers lists it at £3,164. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

1.23
Carat
J
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.6°
Pavilion angle41.1°
OriginNatural
Grading LabIGI
CertificateIGI 628465258
Dimensions6.90 × 6.84 × 4.27 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
IDEAL CUT ROUND BRILLIANT
Top View
6.90 mm6.84 mm1.23 ctJ / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 628465258
Side View
Table 57.0%Crown 35.6°Girdle: MED-STKPavilion 41.1°Culet: NoneDepth 62.2%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: £1,080 GBP|Low: £1,080 GBP|High: £2,683 GBP|Avg: £1,610 GBP|-2.9%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 1£1,080 GBP
Retailer 6£1,367 GBP
Retailer 7£1,383 GBP
Retailer 4£1,389 GBP
Retailer 8£1,396 GBP
Retailer 2£1,448 GBP
Retailer 3£1,843 GBP
Retailer 5£2,651 GBP

37 data points across 8 retailers

14 retailers£1,080 GBP to £3,164 GBP

A
Cheapest Retailer
-
£1,080 GBP
B+
Retailer 2
-
£1,367 GBP
View
A
Retailer 3
-
£1,383 GBP
View
A
Retailer 4
-
£1,389 GBP
View
B+
Retailer 5
-
£1,396 GBP
View
Final sale: no returns
A
Retailer 6
-
£1,448 GBP
View
Retailer 7
-
£1,513 GBP
View
Price last confirmed 8 days ago
B+
Retailer 8
-
£1,513 GBP
View
B+
Retailer 9
-
£1,583 GBP
View
B+
Retailer 10
-
£1,616 GBP
View
B+
Retailer 11
-
£1,746 GBP
View
B+
Retailer 12
-
£1,843 GBP
View
B
Retailer 13
-
£2,651 GBP
View
Most Expensive
B
NZ Jewellers
5ba006be-63d5-4d9e-a568-7e83ac34c81e · Nov 5
£3,164 GBP
$4,258 USD
View
13 more retailers have this diamond
Prices start from £1,080 GBPSave up to £2,083 GBP

Carat Hunter is not affiliated with, endorsed by, or sponsored by any retailer listed. Retailer information is from publicly available sources and may not be current. Verify details directly with the retailer before purchasing. Return terms as we hold them. Check the retailer's own returns page before you buy.

A
1.23ct Round
£1,080 GBP